Publication Date:
2019-08-10
Description:
We spectroscopically confirmed two narrowband-selected redshift 7.0 Ly galaxies and studied their rest-frame UV spectra. The Ly and other UV nebular lines are very useful to confirm the galactic redshifts and diagnose the different mechanisms driving the ionizing emission. We observed two narrowband-selected z = 7.0 Ly candidates in the LAGER Chandra Deep Field South (CDFS) field with IMACS at the Magellan telescope and confirmed they are Ly emitters at z = 6.924 and 6.931. In one galaxy, we also obtained deep near-infrared (NIR) spectroscopy, which yields non-detections of the high-ionization UV nebular lines. We measured the upper limits of the ratios of C iv 1548/Ly, He ii 1640/Ly, O iii]1660/Ly, and C iii]1909/Ly from the NIR spectra. These upper limits imply that the ionizing emission in this galaxy is dominated by normal star formation instead of an active galactic nucleus.
Keywords:
Astrophysics
Type:
GSFC-E-DAA-TN70931
,
Astrophysical Journal (ISSN 0004-637X) (e-ISSN 1538-4357); 876; 2
Format:
text
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